Window lock



Patented Apr. 16, 1935 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to improvements in win dow locks.

The general object of the invention is to provide a simple structure'bymeans of which the relatively slidable sections of a window may belocked with respect to each other.

A further object of the invention is to provide a simple lockingarrangement for looking a window either substantially closed or in anyone of a number of desired partially open positions.

A further object of the invention is to provide a locking device whichwill bind the window sections together so as to prevent rattlingthereof.

A further object of this invention is to provide a locking structure inwhich the locking device itself may be moved to inoperative position andout of contact with the keeper strip to entirely free the windowsections from any latching action.

A still further object of the invention is to provide in combinationwith a locking strip, a locking device having means for preventingunintentional complete disengagement thereof.

These and many other objects, as will appear from the followingdisclosure, are secured by means of the structure of this invention.

This invention resides substantially in the combination, construction,arrangement and relative location of parts, all as will be set forth infull detail in the following description.

In the drawing, 7

Fig. 1 is a perspective view of a portion of a window and its casement,showing the locking device of this invention applied thereto;

Fig. 2 is a side elevational view of the locking" device itself;

Fig. 3 is a bottom plan view thereof;

Fig. 4 is a top plan View thereof;

Fig. 5 is a front elevational view of a portion of the cooperatingstrip;

Fig. 6 is a top plan view of the strip showing the latch member inengagement therewith;

Fig. 7 is a cross sectional viewt'aken on the line 7-4 of Fig. 6 andFig. 8 is a vertical central cross sectional view through the operatingbutton for the locking device, showing the catch for holding it whendesired in operated position.

The nature and functions of the device of this invention will best beunderstood by detailed reference to the drawing.

Fig. 1 shows the structure as applied to an ordinary wooden casementwindow, comprising a pair of relatively slidable sections 2 and 3mounted in a suitable frame I. At 5 is indicated the locking deviceitself which is attached to the upper edge of the lower section, and thecooperating locking bar 4, which isattached along the vertical sidemember of the upper window section.

The locking device itself, as shown inthe figures comprises asubstantially rectangular shaped casing 6, having side flanges 1, bymeans of which it may be secured at the point of use. One end of thecasing is cut away, as indicated at 8, and through the opening thusformed the latch arm 9 projects. This arm is pivotally mounted on apivot pin l0, which passes transversely through the casing. At I I is anoperating button which passes through an opening in the top of thecasing, andis provided with an enlarged inner and I6 which engages withthat part of the arm 9 which extends beyond the pivot pin and lies underthe operating button head it. An opening is cut in the latch arm 9adjacent this head so as to permit free relative movement therebetweenwithout binding of the parts. At i2 is a coil spring encircling pivotpin in, and having its end l3 resting against the rear of the arm 9, andhaving its other end i 4 anchored in the casing 5 thereby to hold theparts in the position shown in full lines (Fig. 2).

. It will be apparent that when the button II is depressed the left handend of.arm 9, Fig. 2, will rise to the dotted position shown, and theother end will descend against the resistance of spring i2. The arm maybe locked in this position by reason of the engagement of a small springfinger H with the shoulder 2| and the button H, as is clear from Fig. 8.This finger may be formed in any suitable manner, as for instance bybeing struck up from the material of the casing 6. The free end of latcharm 9 is provided with cut out portion Hi, to form a curved finger I9which is normally disposed out of the plane of the adjacent parts andthe arm 9, as is clear from Fig. 2. Mounted at the under edge of the arm9, adjacent the finger I9, is the projection 20.

The cooperating keeper strip which is indicated generally at B, ispreferably made of a metal bar 22 which has a flange 23 formed along oneedge thereof, by bending the material of the strip, as is clear forexample from Fig. 6. Distributed along the strip are a plurality ofstruck-up ears or sockets 24 positioned to engage the projection 20 onthe latch arm 9. Preferably the inner walls of the ears or sockets liein a plane which is at a slight angle to the plane of the strip forcooperation with the similarly inclined cooperating side wall of theprojection 28). Thus when the parts 20 and 24 (Fig. '7) are forcedfirmly together the tendency is for them to be drawn towards each other,with the result that when attached to window sectionsthey bind thesections together to prevent rattling.

As is clear from Fig. 6, the normal position of the parts is such thatthe flange 23 lies in the opening l8 and the finger l9 lies along therear face of the flange. The purpose of this arrangement is to permit ofsufficient movement of the latch arm 9 when the button H is depressed sothat the projection 20 may be released from the sockets 24, but thelatch arm 9 cannot be raised sufficiently far so that the catch I! (Fig.8) will engage the button 2| and hold the parts out of engagement. Tounderstand this more clearly, in order to operate the device the windowsection 3 is moved relatively upwardly to bring the latch arm half-waybetween the two projections 24 sufiiciently so that the adjacent socketis out of engagement with the projection 20. Button I I is thendepressed so that the latch arm and its projection 20 are moved out ofthe path of movement of the sockets, but are limited against anyadditional movement by reason of the engagement of finger 19 with theflange 23. There is sufficient space indicated in Fig. 6 between theadjacent faces of flange 23 and finger I9 to allow latch arm 9 to thusswing upwardly moving projection 20 out of the path of sockets 24. Thewindow section 3 may be moved downwardly so as to open the window thedesired amount. Button H is then released and spring I2 moves latch arm9 back to a position where the projection 23 will engage the nearestsocket 24. In order to completely disengage the parts a similaroperation is employed, but in this case the window section 3 is moved tofull open position, or far enough so that the top end of the keeperstrip 4 is completely out of alignment with the latch arm. Furtherdepression of button H will then cause the rising of latch arm 9completely out of the path of the strip 4 and its projections 24 and theparts will be locked in this position until released by reason of thecatch I! engaging the button 2! (Fig. 8). Either window section may thenbe moved up and down without any danger of engagement of the parts.

In addition to this function for the finger IS, the interlockingrelation of the parts 18 and 19 (Fig. 6) also acts to prevent lateralmovement between the window parts as does the engagement of theprojection 20 with the sockets 24. Furthermore, when the projection 20gets in cup or socket 2 4, and then the window section 3 is forced downfirmly, the window sections will be drawn tightly together by reason ofthe inclined engaging walls of the members 24 and 20, eliminatingrattling.

From the above description it will be apparent that this inventionresides in certain principles of construction to produce functions whichmay be accomplished by those skilled in the art, without departure fromthe scope of this invention. I do not, therefore, desire to be strictlylimited to the disclosure as given for purposes of illustration, butrather to the scope of the appended claims.

What I seek to secure by United States Letters Patent is-- l. A latchfor two relatively movable window sash, one of which has a keeper stripwith spaced projections and a flange along one edge, comprising ahousing member adapted to be secured to the top edge of one sash havinga pivotally mounted lever adapted to move in a vertical plane positionedtherein, one end of said lever being adapted to engage any one of theprojections of the keeper strip and having a portion at one side adaptedto coact with the flange on the keeper strip, and a button on saidhousing adapted to depress the other end of said lever to carry theother end out of engagement with a projection on the keeper strip whenthe sash are moved relatively to each other to disengage the lever fromthe keeper strip projection.

2. A latch for two relatively movable window sash, one of which has akeeper strip with spaced projections and a flange along one edge,comprising a housing member adapted to be secured to the top edge of onesash having a pivotally mounted lever adapted to move in a verticalplane positioned therein, the end of said lever being adapted to engageany one of the projections of the keeper strip and having a portion atone side adapted to coact with the flange on the keeper strip, and abutton on said housing adapted to depress said lever to carry theopposite end out of engagement with the projection on the keeper stripwhen the sash are moved relatively to each other in a direction todisengage the lever and keeper strip projection, the part on said levernormally engaging the flange being slightly spaced therefrom in normalposition and adapted normally to prevent complete separation of thelever from the keeper strip.

3. A latch for two relatively movable window sash, one of which has akeeper with spaced projections and a flange along one edge, comprising ahousing adapted to be secured to the upper edge of one of the sash, apivotally mounted lever in said housing adapted to swing in asubstantially vertical plane, a button engaging one end of said leveradapted to raise the opposite end when the button is depressed, a springassociated with the lever for normally keeping one end of the lever downand the other up, the outer end of said lever being provided with twoprojections one of which coacts with any one projection on the keeperstrip and the other of which interlocks with the flange on the keeperstrip.

4. A latch for two relatively movable window sash, one of which has akeeper with spaced projections and a flange along one edge comprising ahousing adapted to be secured to the upper edge of one of the sash, apivotally mounted lever in said housing, spring means associated withthe pivot of said lever adapted to hold the outer end of said lever downand the inner up, a button engaging the inner end adapted to raise theouter end when the button is depressed, said outer end having two parts,one of which is adapted to engage any one projection on the keeper stripand the other the flange on the keeper strip.

5. A latch for two relatively movable window sash, one of which has akeeper with spaced projections and a flange along one edge comprising ahousing adapted to be secured to the upper edge of one of the sash, apivotally mounted lever in said housing, spring means associated withthe pivot of said lever adapted to hold the outer end of said lever downand the inner up, a button engaging the inner end adapted to raise theouter end when the button is depressed, said outer end having two parts,one of which is adapted to engage any one projection on the keeper stripand the other the flange on the keeper strip, and means associated withsaid button for permanently locking the same in depressed position.

LOUIS EISENMAN.

